linux-kernel - [PowerPC-Repo][Merge-Branch]Observing Watchdog Bug: Soft lock up, while running perf

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Message-ID: <99634d5a-3ce6-43f7-9921-801c7d8ca273@linux.vnet.ibm.com>
Date: Tue, 1 Oct 2024 08:16:29 +0530
From: Venkat Rao Bagalkote <venkat88@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PowerPC-Repo][Merge-Branch]Observing Watchdog Bug: Soft lock up,
 while running perf_fuzzer Test case

Greetings!!!


I am observing  kernel soft lock up error, while running few performance 
test case. Issue is seen on PowerPC repo merge branch.

Traces:


[ 7688.815763] CPU: 4 UID: 0 PID: 0 Comm: swapper/4 Kdump: loaded 
Tainted: G           O       6.11.0-gef28aca2b21c #1
[ 7688.815770] Tainted: [O]=OOT_MODULE
[ 7688.815773] Hardware name: IBM,9080-HEX Power11 (architected) 
0x820200 0xf000007 of:IBM,FW1110.00 (NH1110_009) hv:phyp pSeries
[ 7688.815778] NIP:  c00000000003a504 LR: c00000000017603c CTR: 
c00000000047d918
[ 7688.815783] REGS: c000000efdda7c10 TRAP: 0900   Tainted: G           
O        (6.11.0-gef28aca2b21c)
[ 7688.815788] MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 
22042824  XER: 00000001
[ 7688.815798] CFAR: 0000000000000000 IRQMASK: 0
[ 7688.815798] GPR00: c00000000017603c c000000efdda7eb0 c0000000015e3f00 
0000000000000000
[ 7688.815798] GPR04: c0000001130f4110 c000000efaa6e488 0000000000000068 
0000000000000000
[ 7688.815798] GPR08: 0000000ef87b0000 0000000000000000 0000000000008002 
0000000042000824
[ 7688.815798] GPR12: c000000004cc7740 c000000effffa700 0000000000000000 
0000000000000000
[ 7688.815798] GPR16: 0000000004200042 0000000000000000 0000000000000001 
c000000002ce2a80
[ 7688.815798] GPR20: 00000001000b3bdb 000000000000000a c0000000022c3980 
0000000000000000
[ 7688.815798] GPR24: 0000000000000000 0000000ef87b0000 c000000004b85580 
c000000002d1a988
[ 7688.815798] GPR28: 0000000000000002 0000000000000003 c000000002230400 
fcffffffffffffff
[ 7688.815844] NIP [c00000000003a504] arch_local_irq_restore+0x274/0x280
[ 7688.815853] LR [c00000000017603c] handle_softirqs+0xd8/0x3a0
[ 7688.815859] Call Trace:
[ 7688.815861] [c000000efdda7eb0] [c000000000255790] rcu_core+0x78/0x270 
(unreliable)
[ 7688.815869] [c000000efdda7ef0] [c00000000017603c] 
handle_softirqs+0xd8/0x3a0
[ 7688.815875] [c000000efdda7fe0] [c000000000017f40] 
do_softirq_own_stack+0x3c/0x50
[ 7688.815881] [c000000004cc7980] [c000000000175798] 
__irq_exit_rcu+0x12c/0x154
[ 7688.815886] [c000000004cc79b0] [c000000000176648] irq_exit+0x20/0x38
[ 7688.815891] [c000000004cc79d0] [c00000000002aee4] 
timer_interrupt+0x128/0x310
[ 7688.815896] [c000000004cc7a30] [c000000000009ffc] 
decrementer_common_virt+0x28c/0x290
[ 7688.815903] --- interrupt: 900 at plpar_hcall_norets_notrace+0x18/0x2c
[ 7688.815909] NIP:  c0000000000faf64 LR: c0000000010758d8 CTR: 
0000000000000000
[ 7688.815913] REGS: c000000004cc7a60 TRAP: 0900   Tainted: G           
O        (6.11.0-gef28aca2b21c)
[ 7688.815917] MSR:  800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  
CR: 22000224  XER: 00000001
[ 7688.815928] CFAR: 0000000000000000 IRQMASK: 0
[ 7688.815928] GPR00: 0000000000000000 c000000004cc7d00 c0000000015e3f00 
0000000000000000
[ 7688.815928] GPR04: 0000000000000000 0000000000000080 0000000000000000 
0004c4c45b000000
[ 7688.815928] GPR08: ffffffffffffffff 00022e10665720b4 0000000000010000 
00000000000000c0
[ 7688.815928] GPR12: 0000000000000000 c000000effffa700 0000000000000000 
000000002ef16180
[ 7688.815928] GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000
[ 7688.815928] GPR20: 0000000000000000 0000000000000000 0000000000000000 
0000000000000001
[ 7688.815928] GPR24: 0000000000000004 0000000000000000 000006f7fcc51e3e 
0000000000000000
[ 7688.815928] GPR28: 0000000000000000 0000000000000001 c0000000022318e0 
c0000000022318e8
[ 7688.815972] NIP [c0000000000faf64] plpar_hcall_norets_notrace+0x18/0x2c
[ 7688.815977] LR [c0000000010758d8] check_and_cede_processor+0x48/0x5c
[ 7688.815984] --- interrupt: 900
[ 7688.815987] [c000000004cc7d00] [c00000000029bc3c] 
tick_program_event+0x6c/0xe8 (unreliable)
[ 7688.815994] [c000000004cc7d60] [c000000001075d20] 
dedicated_cede_loop+0x94/0x1a0
[ 7688.816000] [c000000004cc7db0] [c000000001075124] 
cpuidle_enter_state+0x258/0x5e4
[ 7688.816006] [c000000004cc7e50] [c000000000c6c4ac] cpuidle_enter+0x4c/0x68
[ 7688.816012] [c000000004cc7e90] [c0000000001e6944] call_cpuidle+0x4c/0x94
[ 7688.816018] [c000000004cc7eb0] [c0000000001eec38] 
cpuidle_idle_call+0x164/0x240
[ 7688.816023] [c000000004cc7f10] [c0000000001eee18] do_idle+0x104/0x1ac
[ 7688.816028] [c000000004cc7f60] [c0000000001ef144] 
cpu_startup_entry+0x48/0x50
[ 7688.816034] [c000000004cc7f90] [c000000000060e3c] 
start_secondary+0x28c/0x290
[ 7688.816040] [c000000004cc7fe0] [c00000000000e358] 
start_secondary_prolog+0x10/0x14
[ 7688.816045] Code: 7f810164 4bfffe80 60000000 7d2000a6 71298000 
40820020 39200000 992d0932 39400000 992d0933 614a8002 7d410164 
<4bfffec8> 0fe00000 4bffffe0 3c4c015b


Regards,

Venkat.